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GT1,
Well, I recall pretty specifically (from when a friend owned a couple of the Alfa Indy engines) that there are significant differences from the Ferrari engine, such as the location of accessory drives, some of the layout of the heads, and such. My "files" are disorganized to say the least and this goes back quite a few years, so I won't argue the point. I could well be wrong, or the caption quoted and my recollection may be saying the same thing in different ways.
As the Alfa Group C car which began the thread apparently dates from 1990 or so, I would not think this engine has any direct connection with the 333 SP engine. The 333 was designated the F130E, the "evolution" of the then yet-to-be-announced F130 engine of the F50. This engine was based on the 1991 641 F1, which used five valve heads. (The 333 SP was a four liter, as opposed to the 4.5 liter of the F50.) The 333 SP engine was developed in late 1993, and was announced in January, 1994.
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